Enable Orch Swapping

[leszko]

Enable Orchestrator Swapping.

This should be merged when:

1. This frontend fix is merged and deployed: https://github.com/livepeer/ui-kit/pull/617
   • Otherwise, a user may see a grey playback screen after the Orchestrator Swap
2. We sort out the ICE issue with connected/closed state: https://github.com/livepeer/go-livepeer/pull/3629
   • Otherwise, the Orch Swap happens even if the stream was closed correctly, this causes an additional request to a new Orchestraror; not the end of the world, but it can temp eat up our capacity

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 31.75357%. Comparing base (7509bd6) to head (cd1a8da). Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
server/ai_mediaserver.go	0.00000%	1 Missing :warning:

Additional details and impacted files

@@                 Coverage Diff                 @@
##              master       #3649         +/-   ##
===================================================
+ Coverage   31.74379%   31.75357%   +0.00978%     
===================================================
  Files            156         156                 
  Lines          47351       47349          -2     
===================================================
+ Hits           15031       15035          +4     
+ Misses         31437       31432          -5     
+ Partials         883         882          -1     

Files with missing lines	Coverage Δ
server/ai_mediaserver.go	4.51056% <0.00000%> (+0.00864%)	:arrow_up:

... and 1 file with indirect coverage changes

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Files with missing lines	Coverage Δ
server/ai_mediaserver.go	4.51056% <0.00000%> (+0.00864%)	:arrow_up:

... and 1 file with indirect coverage changes

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